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Preferences.md

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Chromium's wiki entry for preferences is quite detailed but also somewhat outdated. Here's a simple overview of the few parts of how to create and access a new preference for Brave:

  • The string for the preference key, usually kMyPrefName = "brave.my_pref_name" (either in brave/common/pref_names.h or, more preferrably, local to a component at brave/components/myComponent/common/prefs.h)
  • The registration of the preference type and default value RegisterBooleanPref(kMyPrefName, true) (in brave_profile_prefs.cc or MyComponent::RegisterProfilePrefs)
  • Getting the pref value in some code somewhere (profile()->GetPrefs()->GetBooleanPref)
  • Allowing the user to set the pref on the settings page by adding a polymer settings control pointing at the new setting key "brave.my_pref_name"
  • Allowing the settings page chrome.settingsPrivate API to access the setting (in brave/browser/extensions/api/settings_private/brave_prefs_util.cc)